Dawn Kawamoto writes: Yahoo rolled out an expanded maternity/paternity policy that doubled the family leave for moms to 16 weeks. But new dads at Yahoo get only 8 weeks. It turns out that Yahoo is not the only Fortune 500 company to short-shrift news dads. But, really, do new dads think it's worth crying over? Hmmm...changing diapers or cleaning up code — both are messy, but one smells less.